Assembled concrete shear wall joints and method of assembly thereof

ABSTRACT

A shear wall connector comprising a pre-built member and a connector, the pre-built member comprising a side plate, a peg, and a shear key, the side plate being provided with a first through hole, the peg and the shear key being provided on the inner and outer sides of the side plate respectively, the peg being provided with a threaded hole at the end connected to the side plate and having the threaded hole aligned with the first through hole wherein the connection member comprises an H-beam, the flange plate of the H-beam being provided with a second through-hole and a shear key adaptor hole matching the first through-hole and the shear key in the side plate. The pre-built elements are pre-built in the concrete wall surface and are assembled by means of the connectors. During installation, the shear key is inserted into the shear key adaptor hole.

CROSS-REFERENCE OF THE RELATED APPLICATION

This application is based upon and claims priority to Chinese Patent Application No. 202210423326.X, filed on Apr. 21, 2022, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

The invention relates to the technical field of construction and in particular to a shear wall connector and an assembled shear wall and assembly method.

BACKGROUND

Assembly concrete shear wall structure factory prefabricated, on-site assembly, can significantly reduce labour costs, improve the quality of components, with good economic efficiency and application effect. At present, the main connection of the assembled concrete shear wall structure for there are two ways: the first is in the wall on both sides of the exposed ring hoop, assembled in place in the middle of the hoop inserted longitudinal reinforcement, on-site pouring of concrete will be connected to the same layer of shear wall plate; the second is in the lower wall plate top exposed reinforcement, the lower part of the upper wall plate and the lower wall plate pre-reinforced steel parts of the corresponding position pre-buried sleeve, in the lower wall plate installed in place, after The precast floor slab is installed, the cast-in-place floor slab is poured, the upper wall slab is installed at the upper part of the floor slab elevation and the upper and lower wall slabs are connected by grouting. The existing concrete shear wall slab connection method has the disadvantages of a large amount of temporary support to fix the wall slab, a large amount of wet work on site, difficulty in ensuring the quality of grouting in the sleeve and slow construction progress. How to reduce the amount of wet work on site, reduce the amount of temporary support, guarantee the quality of connection, achieve modular dry connection of shear wall panels, further reduce the construction cost of assembled shear walls, improve economic efficiency, innovative concrete assembled shear wall connection technology is an urgent problem.

SUMMARY

To overcome the above-mentioned deficiencies of existing assembled concrete shear walls, the technical problem to be solved by the present invention is: to provide a shear wall connector and an assembled shear wall and assembly method that can reduce construction costs and improve assembly efficiency.

The technical solution used by the present invention to solve its technical problems is:

Shear wall connection, comprising a pre-built member and a connection member, said pre-built member comprising a side plate, pegs and shear keys, said side plate being provided with a plurality of first through-holes at intervals, said pegs and shear keys also comprising a plurality and being provided at intervals on the inner and outer sides of the side plate, said pegs being provided with threaded holes at the end connected to the side plate and having the threaded holes aligned with the first through-holes, said connection member comprising an H-beam and a rib plate provided at intervals between the two flange plates of the H-beam, said flange plate of the H-beam being provided with second through-holes and shear key adaptation holes matching the first through-holes and shear keys on the side plate.

Further, the first through-hole and the shear key on the described pre-built member are spaced alternately with each other.

Further, the described anti-shear key is of conical construction and the larger end is fixed to the side plate, and the said anti-shear key adaptation hole is an inverted conical hole adapted to the anti-shear key.

Further, the height of the described shear-resistant key is 5-10 mm higher than the depth of the shear-resistant key adaptation hole.

Further, the described shear key adaptation holes are provided at the corners formed by the webs and ribs of the H-beam.

Further, the described peg is provided with a hemispherical top cap at the end of the peg away from the side plate, the outer diameter of the hemispherical top cap being approximately 5 mm greater than the outer diameter of the peg.

Assembled shear wall, comprising a reinforced concrete precast wall panel, further comprising a shear wall connector, wherein the side plates of the precast are provided on the assembly surface of the precast wall panel and the wall panel reinforcement in the precast wall panel is welded to the inside of the side plates, said connector is located between the assembly surfaces of two adjacent precast wall panels, said precast and connector are matched and welded together by means of shear keys and shear key adaptor holes and are secured together by bolts passing through a second through hole, a first through hole and a threaded hole in that order.

Further, for shear walls requiring a floor slab, transverse connections are provided at the top of the shear wall, the described floor slab comprising a prefabricated floor slab and a cast-in-place floor slab, the lapped end of said prefabricated floor slab being lapped on the lower flange plate of the H-beam by means of exposed reinforcement with bending hooks, said cast-in-place floor slab being cast in place on the prefabricated floor slab and having its negative moment reinforcement end welded to the web of the H-beam.

Further, the side plates of the described pre-embedded member are located in the centre of the assembly surface of the prefabricated wall panel and their sides are 8-12 mm from the two sides of the prefabricated wall panel, and the width of the said connection member is equal to the width of the side plates.

Further, the side plates of the described pre-embedded member are located in the centre of the assembly surface of the prefabricated wall panel and their sides are 8-12 mm from the two sides of the prefabricated wall panel, and the width of the described connection member is equal to the width of the side plates.

Method of assembling an assembled shear wall, comprising the steps:

-   -   a. Fabrication of pre-buried elements and connections according         to the dimensions of the walls and floor slabs;     -   b. Using the pre-built elements as borders and welding wall         panel reinforcement on the inside of them to form a         reinforcement mesh with borders;     -   c. Prefabrication of precast wall panels with borders by pouring         concrete inside the reinforcement mesh with borders and also         prefabrication of precast floor slabs with exposed bent         reinforcement;     -   d. Installation of multiple precast wall panels by means of         connectors to form one-, L-, T- and cross-shaped lower assembled         shear walls, and ensuring that there are horizontal connectors         at the parts where floor slabs are to be erected;     -   e. Installation of the prefabricated floor slab by lapping the         exposed floor reinforcement with bends of the prefabricated         floor slab onto the lower flange plate of the horizontal         connector H-beam;     -   f. Tie negative moment reinforcement to the prefabricated floor         slab, with the ends of the negative moment reinforcement welded         to the web of the H-beam, and then pour the cast-in-place floor         slab;     -   g. Install the upper assembled shear wall in accordance with the         installation method of the lower assembled shear wall. After the         assembly is completed, the exposed connectors and pre-built         connectors are treated with anti-rust paint for anti-rust         treatment, and then the gaps in the connectors are filled with         dry hard aerated concrete or rock wool, and finally painted with         cement mortar;

The beneficial effects of the present invention are:

-   -   1. The prefabricated wall panels are installed and connected by         means of connectors and pre-buried members, no temporary support         is required, dry modular construction can be achieved, ensuring         that the connectors and prefabricated wall panels transfer         tension and shear force safely and reliably, enhancing the         integrity of the shear wall;     -   2. The adaptability of the pre-built elements and connectors has         been verified in the factory, which can ensure the precise         positioning of the wall panels and connectors during on-site         installation, which is conducive to speeding up the construction         progress, saving costs and providing better economic benefits.     -   3. The pre-built elements as edge members can play a protective         role for the prefabricated wall panels, which can reduce the         phenomenon of missing corners and falling pieces of         prefabricated wall panels due to collision during handling and         transportation.     -   4. The connectors and pre-buried parts located within the edge         members increase the steel content of the edge members, which         can achieve equal or super strong connection with the         cast-in-place structure and good integrity of the shear wall.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the structure of the shear wall connection of the present invention.

FIG. 2 is a schematic diagram of the structure of the pegs of the present invention.

FIG. 3 is a schematic diagram of the shear key installation structure of the present invention.

FIG. 4 is a schematic diagram of the structure of the assembled shear wall of the present invention.

FIG. 5 is a schematic diagram of the structure of the assembled shear wall reinforcement network of the present invention.

FIG. 6 is a schematic diagram of the floor slab installation structure of the present invention.

The drawings are marked as, 1—pre-built, 2—connection, 3—prefabricated wall slab, 4—prefabricated floor slab, 5—cast-in-place floor slab, 11—side slab, 12—peg, 13—shear key, 14—first through-hole, 15—threaded hole, 16—hemispherical top cap, 21—H-beam, 22—flange plate, 23—shear key adaptation hole, 24—second through-hole, 25—ribbed plate, 26—web, 31—wall slab reinforcement, 41—floor slab reinforcement, 51—negative moment reinforcement.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present invention is further described below in conjunction with the accompanying drawings.

As shown in FIGS. 1-3 , the shear wall connection of the present invention comprises a pre-built member 1 and a connection member 2, the described pre-built member 1 comprising a side plate 11, a peg 12 and a shear key 13, the described side plate 11 having a plurality of first through-holes 14 set at intervals, the described peg 12 and shear key 13 also comprising a plurality and set at intervals on the inner and outer sides of the side plate 11 respectively, the described peg 12 being connected to the side plate 11 at one end with described connecting member 2 comprises an H-beam 21 and a rib 25 spaced between two flange plates 22 of the H-beam 21, described flange plates 22 of the H-beam 21 being provided with a second through-hole 24 and a shear key adaptor hole 23 matching the first through-hole 14 and the shear key 13 in the side plate 11.

The described pre-buried parts 1 are pre-buried on the surface of the concrete wall to facilitate the assembly of the concrete wall by means of the connecting parts 2. During installation the shear key 13 on the pre-buried member 1 is inserted into the shear key adaptation hole 23 to provide shear resistance, which is then fixed by means of bolts passing through the second through hole 24, the first through hole 14 and the peg 12. Compared with the existing assembly methods, the shear wall connectors of the present application do not require temporary support and can achieve dry modular construction, ensuring safe and reliable transmission of tension and shear between the connectors and the prefabricated wall panels, enhancing the integrity of the shear wall; at the same time, the adaptability of the pre-buried parts and connectors has been verified in the factory, which can ensure precise seating of the pre-buried parts and connectors during on-site installation, speeding up the This speeds up the construction process, helps to save costs and has better economic benefits.

To facilitate construction and to ensure the reliability of the assembly, the present application provides some preferred ways of doing so as follows:

To provide a good connection, said first through-hole 14 and shear-resistant key 13 on the described pre-embedded member 1 are alternately spaced apart from each other.

To facilitate alignment of the anti-shear key 13 with the anti-shear key adaptation hole 23 during assembly, the described anti-shear key 13 is a conical table structure and the larger end is fixed to the side plate 11, and the described anti-shear key adaptation hole 23 is an inverted conical hole adapted to the anti-shear key 13.

In the installation process, in order to play a good shear and tensile effect, it is necessary to weld the anti-shear key 13 with the anti-shear key adaptation hole 23 after the docking is completed, therefore, in order to facilitate welding, the height of the described anti-shear key 13 is preferably 5-10 mm higher than the depth of the anti-shear key adaptation hole 23 to ensure that the anti-shear key 13 can pass through the anti-shear key adaptation hole 23 during installation, so as to facilitate subsequent welding around the anti-shear key 13.

Further, as shown in FIG. 3 , the described shear key adaptation hole 23 is preferably set at the corner formed by the web 26 and the rib 25 of the H-beam 21, so that both the web 26 and the rib 25 of the connection 2 can play a certain limiting and fixing role against the shear key 23, thus improving the shear and tensile strength.

For the peg 12, in order to facilitate the processing of the threaded hole 15, a threaded sleeve structure can be used, but in order to avoid concrete entering the threaded hole during the production of the precast wall panel, a hemispherical top cap 16 can be set at the end of the peg 12 away from the side plate 11, as shown in FIG. 2 , the outer diameter of the hemispherical top cap 16 is larger than the outer diameter of the peg 12 by about 5 mm, which can avoid concrete entering the threaded hole 15, and at the same time can avoid The prefabricated concrete wall can also be prevented from being loosened by the prefabricated concrete wall.

The assembled shear wall made with the above-mentioned shear wall connectors, as shown in FIGS. 4 and 5 , comprises a reinforced concrete precast wall panel 3, and also comprises a shear wall connector, wherein the side plate 11 of the pre-buried member 1 is set on the assembly surface of the precast wall panel 3, and the wall plate reinforcement 31 in the precast wall panel 3 is welded to the inner side of the side plate 11, and said connector 2 is located between the assembly surfaces of two adjacent precast wall panels 3. The described pre-embedded member 1 and the connection member 2 are matched and welded together by means of shear keys 13 and shear key adaptation holes 23 and are fixed together by bolts passing through the second through-hole 24, the first through-hole 14 and the threaded hole 15 in that order. The installation of shear wall panels in one-piece, L-shaped, T-shaped or continuous-beam sections can be achieved by rationalising the position of pre-built parts 1 and connectors 2, which is highly versatile.

Further, in order to accommodate the construction of the floor slab, a transverse connection 2 is provided at the top of the shear wall where the floor slab is to be erected. according to the Technical Specification for Assembled Concrete Structures (JGJ 1-2014), the floor slab of an assembled concrete frame structure is to be provided with a cast-in-place layer to ensure structural integrity, so that the described floor slab comprises a prefabricated floor slab 4 and a cast-in-place floor slab 5, the said prefabricated floor slab 4 having The lap end of the described prefabricated floor slab 4 is lapped on the lower flange of the H-beam 21 by means of exposed floor bars 41 with bending hooks, and the said cast-in-place floor slab 5 is cast-in-place on the prefabricated floor slab 4 and the end of its negative moment bars 51 are welded to the web 26 of the H-beam 21.

In order to avoid rusting of the exposed steel structure, the side plates 11 of the described prefabricated part 1 are located in the centre of the assembly surface of the prefabricated wall panel 3, and their sides are 8-12 mm away from the two sides of the prefabricated wall panel 3. The width of the described connection 2 is comparable to the width of the side plates 11. This leaves a gap after the assembly is completed, which facilitates subsequent painting with cement mortar and ensures a flat wall surface.

For the specific assembly method of assembled shear walls, as shown in FIGS. 5 and 6 , the following steps are included.

-   -   a. Making pre-buried parts and connections according to the         dimensions of the walls and floor slabs;     -   b. Using the pre-built elements as borders and welding wall slab         reinforcement on the inside of them to form a reinforcement mesh         with borders;     -   c. Prefabrication of precast wall panels with borders by pouring         concrete inside the reinforcement mesh with borders and also         prefabrication of precast floor slabs with exposed bent         reinforcement;     -   d. Installation of multiple prefabricated wall panels by means         of connectors to form one-, L-, T- and cross-shaped lower         assembled shear walls, and ensuring that there are horizontal         connectors in the areas where floor slabs are to be erected;     -   e. Installation of the prefabricated floor slab by lapping the         exposed floor reinforcement with curved hooks of the         prefabricated floor slab onto the lower flange plate of the         horizontal connector H-beam;     -   f Tying negative moment reinforcement to the prefabricated floor         slab, with the ends of the negative moment reinforcement welded         to the web of the H-beam and then pouring the cast-in-place         floor slab;     -   g. Install the upper assembled shear wall according to the         installation method of the lower assembled shear wall, and after         the assembly is completed, rustproof the exposed connections and         pre-built connections with anti-rust paint, then fill the gaps         in the connections with dry hard aerated concrete or rock wool,         and finally paint them with cement mortar.

Using the shear wall connectors and assembly method of the present invention, dry modular construction of assembled shear walls can be achieved, which enhances the integrity of the shear walls, helps to speed up the construction progress, saves costs and has better economic benefits. 

1. A shear wall connection member, comprising a pre-built member and a connection member, the pre-built member comprising a side plate, pegs, and shear keys, the side plate being provided with a plurality of first through holes at intervals, the pegs and shear keys being provided at intervals on the inner and outer sides of the side plate respectively, each peg is provided with a threaded hole at the end where it is attached to the side plate and the threaded hole is aligned with the first through hole, and the connection member comprises an H-beam and a rib spaced between the two flange plates and the web of the H-beam, flange plate of the H-beam being provided with the same connection as the first through hole in the side plate, the connection member comprising an H-beam and a rib spaced between the two flange plates and the web of the H-beam, the flange plate of the H-beam being provided with the same connection as the first through hole in the side plate with a second through-hole and shear key adaptation holes matching the first through-hole and shear key on the side plate.
 2. The shear wall connection member according to claim 1, wherein the first through holes and shear keys on the pre-built member are spaced alternately with each other.
 3. The shear wall connection member according to claim 1, wherein the shear key is a conical table structure and the larger end is fixed to the side plate, and the shear key adaptor hole is an inverted conical hole adapted to the shear key.
 4. The shear wall connection member according to claim 1, wherein the height of the shear key is 5-10 mm higher than the depth of the shear key adaptation hole.
 5. The shear wall connection member according to claim 1, wherein the shear key adaptation hole is provided at the corner formed by the web and the ribs of the H-beam.
 6. The shear wall connection member according to claim 1, wherein the peg is provided with a hemispherical top cap at one end away from the side plate, and the outer diameter of the hemispherical top cap being larger than the outer diameter of the peg.
 7. An assembled shear wall, comprising a reinforced concrete precast wall panel and the shear wall connection member according to claim 1, wherein the side panels of a precast member are provided on the assembly surface of the precast wall panel, and the wall panel reinforcement in the precast wall panel is welded to the inner side of the side panels, the connection member being located between the assembly surfaces of two adjacent prefabricated wall panels, said prefabricated parts and the connection being matched and welded together by means of shear keys and shear key adaptation holes and being held together by bolts passing through second through holes, first through holes, and threaded holes in turn.
 8. The assembled shear wall as claimed in claim 7, wherein for shear walls requiring a floor slab, a transverse connection is provided at the top of the shear wall, the floor slab comprising a prefabricated floor slab and a cast-in-place floor slab, the lapped end of the prefabricated floor slab being lapped to the lower flange plate of the H-beam by means of an exposed floor slab reinforcement with bending hooks, the cast-in-place floor slab is cast in place on the prefabricated floor slab and the end of a negative moment reinforcement is welded to the web of the H-beam.
 9. The assembled shear wall as claimed in claim 8, wherein the side plate of the prefabricated member is located in the centre of the assembled face of the prefabricated wall slab and its sides are 8-12 mm from both sides of the prefabricated wall slab, and the width of the described connection being equal to the width of the side plate.
 10. A method for assembling the assembled shear wall according to claim 9, comprising the following steps: a. making pre-built parts and connections according to the dimensions of the walls and floor slabs; b. forming a reinforcement mesh with a border by using the pre-built elements as a border and welding wall slab reinforcement on the inside thereof; c. prefabrication of precast wall panels with borders by pouring concrete inside the reinforcement mesh with borders and also prefabrication of precast floor slabs with exposed bent reinforcement; d. installation of multiple prefabricated wall panels by means of connectors to form one-, L-, T- and cross-shaped lower assembled shear walls, and ensuring that there are horizontal connectors in the areas where floor slabs are to be erected; e. installation of the prefabricated floor slab by lapping the exposed floor reinforcement with curved hooks of the prefabricated floor slab onto the lower flange plate of the horizontal connector H-beam; f. tying negative moment reinforcement to the prefabricated floor slab, with the ends of the negative moment reinforcement welded to the web of the H-beam and then pouring the cast-in-place floor slab; and g. installing the upper assembled shear wall in accordance with the installation method of the lower assembled shear wall; after the assembly is completed, the exposed connectors and pre-built connectors are treated with anti-rust paint for anti-rust treatment, and then the gaps in the connectors are filled with dry hard aerated concrete or rock wool, and finally painted with cement mortar. 